body{
    margin: 0;
    padding: 0;
}
.mian{
    background: rgb(204, 196, 196);
    padding: 10px 200px;

}
h1 {
    color:rgb(224, 40, 40);
    font-size: 30px;
    display:inline-block;
    border-bottom: 3px solid rgb(187, 69, 69)
}
ul{
    margin: 0px 5px;
    display: inline-block;
}
ul li{
    list-style: none;
    /* margin: 20px; */
    float: left;
}
/* 清浮动 */
.clear:after{
    content:"";
    display:block;
    height: 0;
    overflow:hidden;
    clear:both;

}
.border{
    border:2px  solid rgb(49, 46, 46)
}

